Mechanical movement.



`A. D, BLODGETTA.

MECHANICAL MOVEMENT. APPLICATION FILEDVocT. 23. |915.

1 ,183',795. l Patented' May 16, 1916.

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ALLEN D. BLoDGET'r, or Los ANGELES., oALIroniv'rA.

MECHAICAL MOVEMENT.

Specification of Letters atent.

Patented May' 16, 1916.

Appntiii inea october 23, 1.1515'.y serial No. 57,611'.

To' all whom t may concern.-

Be it known that I, ALLEN D. BLODG'ETT, a citizen of the United States, residing at Los Angeles, in the county ofLos Angeles and State of California, *have invented a new and useful Mechanical Movement, of which the following is aspecification.

My invention relates to mechanicalmove'- ments, and the principal objectv of my in# vention is to produce 'a 'mechanical movement which is especially adapted to operate the valves of 'a four stroke cycle 'internal' combustion' engine. This mechanical movement may, however, be used for any purpose where similar resultsy are desired. l

In a four stroke cycle gas engine it is necessary to lift each of the exhaust and intake valves once in each two revolutionsof the crank shaft, and it is further necessary that the valve Vbe lifted quickly and allowedto seat quickly if the best results are to be obtained.

It is common practice in the gas engine art to provide an auxiliary cam shaft which is operated by means of timing gears from the crankshaft so that it rotates once for each two rotations of the crank shaft, cams being secured to this cam shaft for operating the valves. In my invention no auxiliary cam shaft is necessary, eccentrics being turned directly on the crank shaft, these eccentii'cs operating the valves at their proper time without the necessity forv timin'ggears or 4ec'luivalent structure. f

In the drawings, which are for illustrative purposes only: Figure 1 is a somewhat diagrammatic vertical section through a por# tion of an internal combustion' engine equipped with my invention.' Fig. 2 is an enlarged section showing the method of applying the mechanical movement thereto. Fig. 3 is a section o'n a plane represented by the knew-a3 of Fig. 2 looking in the direction of the arrows. v

In this form 'and application of my in vention, a crank shaft 11 provided turning freely in bearings 12 formed on a crank case k13. A. cylinder casing leis'sec'ured to the crank case 13. .A piston 15 'slides n the cylinder casing 14 having a connecting rod 16 pivoted thereon. The connecting rod 16 engages a crank 17, this crank being carried between arms 18 having eccentrics 19 turned thereon. Turning freely on the eccentrics 19 are. eccentric straps 20, each of which has a cylindrical portion 21k fitting tightly raround the eccentrics 19. Cut in the outside of the eccentric projection 21 are working openings 22 and 23 and clearance openings 24 'and 25.

Secured to the side of the crank case 13 are finger plates k26, these plates being duplicates of each other, and each having secured thereon a series of five fingers 27, 28, 29,30

and 31, these fingers being radial with re- -spect to the axis of the crank shaft 11 and being/disposed equally distant around the circle, the center line of each of them making an langleof 72 degrees with the center line of the adjacent finger.v The proportions ofthe above parts must follow the following rule if the parts are to operate successfully together, the center of the crank shaft .being denoted by the letter O, and the cen.- ter of the eccentric being denoted the letter E. Radial lines O-A and (I4-B are drawn through the centerof the fingers 28 and 30, and a line (l--DA is drawn at right angles to the line E-O connecting the centers mentioned above. 'theli'ne O-B and the line C-Dor X determines the outside "diameter of the 'eccenl tri'c strap 20. The working openings 23 have a width M equal to .the width M of each of the yfingers 27, 28, 29, 30 andf3l, being cut away on the inner side to give a clearance to these fingers asthe strap turns.

Formed on lthe eccentric strapy 2O are cam f members 32 and 320, these camv members being 'diametrically opposite each other, ex-l tending out a distance 'L from the outer edge of the eccentric strap 21 in such a pov siti'onthat theyr engage and operate the valve stem 33, this valve stem extending upi wardly and operatinguthe valves oflthe engine through means not shown. Byy variationsin the dimensions L the time the valve 33 is kept open 0n the intake andcXhlSt strokes can be controlled. f.

The intersection of l The method of operation of the invention is as follows: The rotation of the crank shaft 11 being in the direction of the arrow 40, shown in F ig. 3, the working opening 22 being engaged by the finger 29, the fingers 28 and 30 are in the clearance openings 24 and 25, and the fingers 27 and 31 are entirely free and disengaged. As the eccentric 19 rotates, it forces the opening 23 to the right and downward, as seen in Fig. 3, until the finger 27 enters the opening 23. After the opening 23 has been engaged by the finger 27, the opening 22 is disengaged from the finger 29 and the opening 23 slides in the direction of the arrow Ll1 until the line.O`-E coincides With the radial line O--F, passing through the finger 27. Further rotation of the eccentric 19 causes the opening 22 to engage the finger 30.

The cycleof operations for four revolutions of the eccentric 19 is as follows: Starting with the opening 22 engaged by the finger 29, the opening 23 is engaged by the f finger 27, the opening 22 is engaged by the finger 30, the opening 23 is engaged by the finger 28, the opening 22 is engaged by the finger 31, the opening 23 is engaged by the finger 29,'the opening 22 is engaged by the finger 27 the opening 23 is engaged by the finger 30, the opening 22 is engaged by the finger 28, theopening 28 is engaged by the finger 31, and the opening 22 is engaged by thefinger 29, returning the parts to their original position. Vhile the eccentric 19 rotates four times in the direction of the arrow 40, the eccentric 20 rotates once in the opposite direction to the arrow 40, so that thelcam 32 operates the valve 33 once in every vfour revolutionsof the crank shaft, and the cam 320 operates the valve 33 once every four revolutions ofthe crank shaft. The result is that the valve 33 is lifted once every two revolutions, or vonce every four strokes of the piston, this being the desired result to operate the valves of a four stroke kcycle engine. .The dotted line 50 of Fig. 3

. in this invention without altering the principle upon which .it works, or 'the real relationship of the parts. For example, the plate 26 may be called a primary member, and the eccentric strap 20 may be called the secondary member. The shaft 11 and the eccentric 19 are for a single purpose, z'. e., the actuation .of the secondary member eccentrically with relation to the primary member, and might be called the actuating means. Obviously a crank might be used in either the primary or the secondary member without changing the essential nature' of the actuating means. The fingers 27, 28, 29, 30 and 31 might be called radial arms, and

walls forming the slots 22 and 23 might be'- called engaging members. In the drawing the radial arms are projections, and the engaging members are the walls of slots. A reversal of this feature by substituting slots for the fingers, and projections for theslots 22 and 23 is also obviously within the spirit of my invention.

I claim as my invention 1. A mechanical movement comprising a stationary support, a shaft turning freely in said support, an eccentric secured to said shaft, kan eccentric strap turning freely on said eccentric and having a pair ofv Working openings formed 180O apart therein, a series of projections on said support so placed that they engage working openings and rotate said eccentric strap as the shaft is turned, a valve stem, and means on said eccentric strap for lifting said valve stem.

2. A mechanical movement comprising a stationary support, a shaft turning freely in said support, an eccentric secured to said shaft, an eccentric .strap turning freely on said eccentric and having a pair of working openings formed 180o apart therein, a series of radial fingers secured equally distant around said support in such a position that they engage and turn said eccentric strap as said shaft turns', a valve stem, and means on said eccentric strap for lifting said valve stem. i 3. A mechanical movement comprising a stationary support, a shaft turning freely in said support, an eccentric secured to said shaft, an eccentric strap turning freely on said eccentric and having a pair of working openings formed 180O apart therein, a series of five radial fingers secured equally distant around saidl Support in such a position that they engage and turn said eccentric strap as said shaft turns, a valve stem, and means on said eccentric strap for lifting said valve stem.

4. A mechanical movement comprising a primary member, a secondary member, means for lcausing one of these members to move eccentrically with relation to the other, radial structure on the primary or the secondarymember, engaging structure on the other member kso placed as to rotate one of said members with relation to the other, a valve stem fixed with relation to one of said members, and means on the other member for lifting said valve stem.

5. A mechanical movement' comprising a primary member, a secondary member, means for Causing one of these members to other, five radial engaging structures seone of said members, and means on the other site sides of the center of the said last named ALLEN D. BLODGETT.

move eccentrcally with relation to the member, a valve stem fixed with relation to cured to one of said members at equal member for lifting said Valve stem. 10 angular distances about its center, engaging In testimony whereof, I have hereunto set means on the other member said engaging my hand at Los Angeles, California, this means being located on diametrically oppo- 18th day of October, 1915.

Copies of this patent may `be obtained for ve cents `each, by addressingthe Commissioner ot Patents.

' Washington, D. C. 

